Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c17a0255bb5896…

MALICIOUS

PDF

85.7 KB Created: 2021-08-21 11:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1649bcb320502a673f2ab234de20748e SHA-1: fd1ad4b145476307c2dce475b21fa186b0e89e8a SHA-256: 76c17a0255bb5896016bd40e34a747035c7befca37b652248b480616658e6226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210628120738.pdf
    • https://tekartltd.com/upload/files/teminiluv.pdf
    • http://abroadster.com/files/zumalub.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/h488u744fjo2p5nqjaiokqt7mo/tulilaburubuxodipu.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/558c1c9fb709029a92b2b8e17193cf94/47541969987.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608decbacb854---kazazexesujalavidozo.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/95195208632.pdf
    • http://ahlhy.com/uploads/file/201820196919.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57816ac5e9---967094529.pdf
    • http://101-games.ru/images/uploads/files/baxilazos.pdf
    • http://golden-candies.ru/webroot/files/files/besodewujewonolemanexepe.pdf
    • https://trimix.bg/UserFiles/File/lapekekav.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a2c73fa7---38757784752.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/zekasobamewo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95c548bed---9483492769.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/dotaxovuwapepa.pdf
    • http://carsonpokebar.com/uploads/files/83247134436.pdf
    • http://ilkyoukais.com/Images/Media/files/dupinadipenikivadavokodav.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/50519642425.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d5eff2c04---87260363076.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6b768064ccefcbe7c5fb94eda6132a29/88187741918.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/aa3f768c1b1ff7f17537b7d6738a7f14/94112057971.pdf
    • http://simonide.org/userfiles/file/90691463864.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befd021f5e---wijiwuzedawidado.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec004aa8cb---10962912028.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+remove+child+lock+on+bosch+dishwasher
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 16792 bytes
font_01_sfnt_off00010291.bin
7b7a0b9a2f1f9a745adf84bec8b486081d94618f42931b95709e09ed532079e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 16772 bytes
font_02_sfnt_off00012e07.bin
36c099698b10a875009e198e573bf0cee1058dc7ab4c49d35c1a60ea3db0d2cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 11012 bytes